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Window sill pan before setting the window checklist

A pre-setting window sill-pan checklist for approved pan type, positive drainage, end dams and back dam where required, corner continuity, substrate preparation, compatible primer and membrane, fastener and shim zones, integration with the weather-resistive barrier, weep path, cure, and photographic evidence.

6 items to check

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Pan material and detail are approved for the window and wall system

Critical item

Prefabricated, sheet, liquid-applied, or combination pans should be compatible with all adjoining materials.

The sill and pan drain toward the exterior without blocked outlets

Critical item

Incidental water should have a continuous gravity path to the exterior or approved drainage plane.

Corners, seams, end dams, and back dam are continuous as required by the detail

Critical item

The pan should contain and redirect water at vulnerable lower corners.

Pan and lower weather-resistive barrier are integrated in drainage order

Critical item

Water from the opening should discharge onto the exterior drainage plane, not behind it.

Fastener, shim, and sealant zones will not puncture or trap water improperly

Critical item

The window installation method should preserve the pan and intended drainage.

Pan cure, cleanliness, continuity, and photos are accepted before window placement

The pan should be protected from damage and documented before concealment.

Use after the rough opening passes inspection but before the window is placed. The sill pan is a concealed drainage component and should be visible long enough to verify continuity and outlet. Do not use unsafe ladders, walk roofs, remove structural support, or disturb lead, asbestos, or mold-containing assemblies. Require qualified building-envelope, structural, roofing, window, door, and siding professionals where appropriate.

Reference standards

  • Approved wall, window, door, roof, deck, siding, drainage, and structural details; adopted state and local building and energy code; permit and inspection conditions; authority having jurisdiction requirements; signed scope; and exact flashing, membrane, sealant, fastener, cladding, window, door, and drainage manufacturer instructions
  • Exact sill-pan, flashing membrane, liquid flashing, primer, sealant, window, and wall-system instructions

    • Tools

  • Approved drawings, opening and product submittals, wall-section details, permit records, and authorized changes
  • Tape measure, level, flashlight, camera, and owner-safe ground-level observations
  • Dated pre-cover photographs and manufacturer-compatible material records showing drainage-plane continuity

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